Im cutting ties with my family for good, Has anyone else done this?

My family members are leeches. They take and take and give nothing back in return. I have cut my mother off and havent spoken to her in almost 2 years and my brother and sister are next. I have done so much for them and they still arent there for me when I need them so I figured that if I cant have a healthy relationship with these people then I shouldnt have any kind of relationship with them. I dont want my son to grow up hating people and using them the way my family does. When my first son ped away the only family member that came to his funeral was my brother and I wish he hadnt. My sister and mother only said that they didnt want to come. But my brother came. He flipped out because he hadnt been to Chicago before, insisted that my grieving husband show him around town and threw a hissy fit at our house right after the funeral! It made things so much worse for my husband and I. To make matters worse I was 5 months pregnant with our second son. Anyway this is just one example of how heartless my family members are. So I feel I have no choice but to let them go. I dont hate them just im just tired of trying to make them treat me like family. Has anyone else cut off their family? and did it make your life better?